370 automatic gearbox oil and filter change

[Walker]

On the 370 auto gearbox as any one changed the oil and filter with after market filter and had problems removing filter holding fasteners or retightening them 

some one said don’t change it because one of the fasteners is held with a nut inside the spool which turns so you can’t retighten it 

thought  they  were all set screws 

mines done 30k so would like to change oil   Thanks